/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.impl;



import com.bff.gaia.unified.sdk.extensions.sql.impl.rel.UnifiedRelNode;

import org.apache.calcite.sql.SqlNode;



/**

 * An interface that planners should implement to convert sql statement to {@link UnifiedRelNode} or

 * {@link SqlNode}.

 */

public interface QueryPlanner {

  /** It parses and validate the input query, then convert into a {@link UnifiedRelNode} tree. */

  UnifiedRelNode convertToUnifiedRel(String sqlStatement) throws ParseException, SqlConversionException;



  /** Parse input SQL query, and return a {@link SqlNode} as grammar tree. */

  SqlNode parse(String sqlStatement) throws ParseException;

}